FFmpeg
Data Structures | Macros | Enumerations | Functions | Variables
vf_perspective.c File Reference
#include "libavutil/avassert.h"
#include "libavutil/eval.h"
#include "libavutil/imgutils.h"
#include "libavutil/pixdesc.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"

Go to the source code of this file.

Data Structures

struct  PerspectiveContext
 
struct  ThreadData
 Used for passing data between threads. More...
 

Macros

#define SUB_PIXEL_BITS   8
 
#define SUB_PIXELS   (1 << SUB_PIXEL_BITS)
 
#define COEFF_BITS   11
 
#define LINEAR   0
 
#define CUBIC   1
 
#define OFFSET(x)   offsetof(PerspectiveContext, x)
 
#define FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
 

Enumerations

enum  PERSPECTIVESense { PERSPECTIVE_SENSE_SOURCE = 0, PERSPECTIVE_SENSE_DESTINATION = 1 }
 
enum  EvalMode {
  EVAL_MODE_ONCE, EVAL_MODE_FRAME, EVAL_MODE_NB, EVAL_MODE_INIT,
  EVAL_MODE_FRAME, EVAL_MODE_NB, EVAL_MODE_INIT, EVAL_MODE_FRAME,
  EVAL_MODE_NB, EVAL_MODE_INIT, EVAL_MODE_FRAME, EVAL_MODE_NB,
  EVAL_MODE_INIT, EVAL_MODE_FRAME, EVAL_MODE_NB, EVAL_MODE_INIT,
  EVAL_MODE_FRAME, EVAL_MODE_NB, EVAL_MODE_INIT, EVAL_MODE_FRAME,
  EVAL_MODE_NB, EVAL_MODE_INIT, EVAL_MODE_FRAME, EVAL_MODE_NB,
  EVAL_MODE_INIT, EVAL_MODE_FRAME, EVAL_MODE_NB
}
 
enum  {
  VAR_W, VAR_H, VAR_IN, VAR_ON,
  VAR_VARS_NB
}
 

Functions

 AVFILTER_DEFINE_CLASS (perspective)
 
static double get_coeff (double d)
 
static int calc_persp_luts (AVFilterContext *ctx, AVFilterLink *inlink)
 
static int config_input (AVFilterLink *inlink)
 
static int resample_cubic (AVFilterContext *ctx, void *arg, int job, int nb_jobs)
 
static int resample_linear (AVFilterContext *ctx, void *arg, int job, int nb_jobs)
 
static av_cold int init (AVFilterContext *ctx)
 
static int filter_frame (AVFilterLink *inlink, AVFrame *frame)
 
static av_cold void uninit (AVFilterContext *ctx)
 

Variables

static const AVOption perspective_options []
 
static enum AVPixelFormat pix_fmts []
 
static const char *const var_names [] = { "W", "H", "in", "on", NULL }
 
static const AVFilterPad perspective_inputs []
 
static const AVFilterPad perspective_outputs []
 
const AVFilter ff_vf_perspective
 

Macro Definition Documentation

◆ SUB_PIXEL_BITS

#define SUB_PIXEL_BITS   8

Definition at line 32 of file vf_perspective.c.

◆ SUB_PIXELS

#define SUB_PIXELS   (1 << SUB_PIXEL_BITS)

Definition at line 33 of file vf_perspective.c.

◆ COEFF_BITS

#define COEFF_BITS   11

Definition at line 34 of file vf_perspective.c.

◆ LINEAR

#define LINEAR   0

Definition at line 36 of file vf_perspective.c.

◆ CUBIC

#define CUBIC   1

Definition at line 37 of file vf_perspective.c.

◆ OFFSET

#define OFFSET (   x)    offsetof(PerspectiveContext, x)

Definition at line 57 of file vf_perspective.c.

◆ FLAGS

Definition at line 58 of file vf_perspective.c.

Enumeration Type Documentation

◆ PERSPECTIVESense

Enumerator
PERSPECTIVE_SENSE_SOURCE 

coordinates give locations in source of corners of destination.

PERSPECTIVE_SENSE_DESTINATION 

coordinates give locations in destination of corners of source.

Definition at line 60 of file vf_perspective.c.

◆ EvalMode

enum EvalMode
Enumerator
EVAL_MODE_ONCE 
EVAL_MODE_FRAME 
EVAL_MODE_NB 
EVAL_MODE_INIT 
EVAL_MODE_FRAME 
EVAL_MODE_NB 
EVAL_MODE_INIT 
EVAL_MODE_FRAME 
EVAL_MODE_NB 
EVAL_MODE_INIT 
EVAL_MODE_FRAME 
EVAL_MODE_NB 
EVAL_MODE_INIT 
EVAL_MODE_FRAME 
EVAL_MODE_NB 
EVAL_MODE_INIT 
EVAL_MODE_FRAME 
EVAL_MODE_NB 
EVAL_MODE_INIT 
EVAL_MODE_FRAME 
EVAL_MODE_NB 
EVAL_MODE_INIT 
EVAL_MODE_FRAME 
EVAL_MODE_NB 
EVAL_MODE_INIT 
EVAL_MODE_FRAME 
EVAL_MODE_NB 

Definition at line 65 of file vf_perspective.c.

◆ anonymous enum

anonymous enum
Enumerator
VAR_W 
VAR_H 
VAR_IN 
VAR_ON 
VAR_VARS_NB 

Definition at line 121 of file vf_perspective.c.

Function Documentation

◆ AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS ( perspective  )

◆ get_coeff()

static double get_coeff ( double  d)
inlinestatic

Definition at line 104 of file vf_perspective.c.

Referenced by config_input().

◆ calc_persp_luts()

static int calc_persp_luts ( AVFilterContext ctx,
AVFilterLink inlink 
)
static

Definition at line 123 of file vf_perspective.c.

Referenced by config_input(), and filter_frame().

◆ config_input()

static int config_input ( AVFilterLink inlink)
static

Definition at line 220 of file vf_perspective.c.

◆ resample_cubic()

static int resample_cubic ( AVFilterContext ctx,
void *  arg,
int  job,
int  nb_jobs 
)
static

Definition at line 274 of file vf_perspective.c.

Referenced by init().

◆ resample_linear()

static int resample_linear ( AVFilterContext ctx,
void *  arg,
int  job,
int  nb_jobs 
)
static

Definition at line 353 of file vf_perspective.c.

Referenced by init().

◆ init()

static av_cold int init ( AVFilterContext ctx)
static

Definition at line 428 of file vf_perspective.c.

◆ filter_frame()

static int filter_frame ( AVFilterLink inlink,
AVFrame frame 
)
static

Definition at line 440 of file vf_perspective.c.

◆ uninit()

static av_cold void uninit ( AVFilterContext ctx)
static

Definition at line 482 of file vf_perspective.c.

Variable Documentation

◆ perspective_options

const AVOption perspective_options[]
static
Initial value:
= {
{ "x0", "set top left x coordinate", OFFSET(expr_str[0][0]), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
{ "y0", "set top left y coordinate", OFFSET(expr_str[0][1]), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
{ "x1", "set top right x coordinate", OFFSET(expr_str[1][0]), AV_OPT_TYPE_STRING, {.str="W"}, 0, 0, FLAGS },
{ "y1", "set top right y coordinate", OFFSET(expr_str[1][1]), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
{ "x2", "set bottom left x coordinate", OFFSET(expr_str[2][0]), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
{ "y2", "set bottom left y coordinate", OFFSET(expr_str[2][1]), AV_OPT_TYPE_STRING, {.str="H"}, 0, 0, FLAGS },
{ "x3", "set bottom right x coordinate", OFFSET(expr_str[3][0]), AV_OPT_TYPE_STRING, {.str="W"}, 0, 0, FLAGS },
{ "y3", "set bottom right y coordinate", OFFSET(expr_str[3][1]), AV_OPT_TYPE_STRING, {.str="H"}, 0, 0, FLAGS },
{ "interpolation", "set interpolation", OFFSET(interpolation), AV_OPT_TYPE_INT, {.i64=LINEAR}, 0, 1, FLAGS, "interpolation" },
{ "linear", "", 0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, FLAGS, "interpolation" },
{ "cubic", "", 0, AV_OPT_TYPE_CONST, {.i64=CUBIC}, 0, 0, FLAGS, "interpolation" },
{ "sense", "specify the sense of the coordinates", OFFSET(sense), AV_OPT_TYPE_INT, {.i64=PERSPECTIVE_SENSE_SOURCE}, 0, 1, FLAGS, "sense"},
{ "source", "specify locations in source to send to corners in destination",
0, AV_OPT_TYPE_CONST, {.i64=PERSPECTIVE_SENSE_SOURCE}, 0, 0, FLAGS, "sense"},
{ "destination", "specify locations in destination to send corners of source",
{ "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
{ "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
{ "frame", "eval expressions per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
{ NULL }
}

Definition at line 71 of file vf_perspective.c.

◆ pix_fmts

enum AVPixelFormat pix_fmts[]
static

◆ var_names

const char* const var_names[] = { "W", "H", "in", "on", NULL }
static

Definition at line 120 of file vf_perspective.c.

Referenced by calc_persp_luts().

◆ perspective_inputs

const AVFilterPad perspective_inputs[]
static
Initial value:
= {
{
.name = "default",
.filter_frame = filter_frame,
.config_props = config_input,
},
}

Definition at line 489 of file vf_perspective.c.

◆ perspective_outputs

const AVFilterPad perspective_outputs[]
static
Initial value:
= {
{
.name = "default",
},
}

Definition at line 498 of file vf_perspective.c.

◆ ff_vf_perspective

const AVFilter ff_vf_perspective
Initial value:
= {
.name = "perspective",
.description = NULL_IF_CONFIG_SMALL("Correct the perspective of video."),
.priv_size = sizeof(PerspectiveContext),
.init = init,
.priv_class = &perspective_class,
}

Definition at line 505 of file vf_perspective.c.

pix_fmts
static enum AVPixelFormat pix_fmts[]
Definition: vf_perspective.c:97
FILTER_PIXFMTS_ARRAY
#define FILTER_PIXFMTS_ARRAY(array)
Definition: internal.h:171
EVAL_MODE_FRAME
@ EVAL_MODE_FRAME
Definition: vf_perspective.c:67
AV_PIX_FMT_YUV440P
@ AV_PIX_FMT_YUV440P
planar YUV 4:4:0 (1 Cr & Cb sample per 1x2 Y samples)
Definition: pixfmt.h:99
PERSPECTIVE_SENSE_SOURCE
@ PERSPECTIVE_SENSE_SOURCE
coordinates give locations in source of corners of destination.
Definition: vf_perspective.c:61
AV_PIX_FMT_GBRAP
@ AV_PIX_FMT_GBRAP
planar GBRA 4:4:4:4 32bpp
Definition: pixfmt.h:205
AV_PIX_FMT_YUVJ411P
@ AV_PIX_FMT_YUVJ411P
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples) full scale (JPEG), deprecated in favor ...
Definition: pixfmt.h:248
EVAL_MODE_NB
@ EVAL_MODE_NB
Definition: vf_perspective.c:68
init
static av_cold int init(AVFilterContext *ctx)
Definition: vf_perspective.c:428
AV_PIX_FMT_YUVJ422P
@ AV_PIX_FMT_YUVJ422P
planar YUV 4:2:2, 16bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV422P and setting col...
Definition: pixfmt.h:79
AV_PIX_FMT_YUVA420P
@ AV_PIX_FMT_YUVA420P
planar YUV 4:2:0, 20bpp, (1 Cr & Cb sample per 2x2 Y & A samples)
Definition: pixfmt.h:101
LINEAR
#define LINEAR
Definition: vf_perspective.c:36
AV_PIX_FMT_YUV420P
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:191
AV_PIX_FMT_YUVJ444P
@ AV_PIX_FMT_YUVJ444P
planar YUV 4:4:4, 24bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV444P and setting col...
Definition: pixfmt.h:80
perspective_inputs
static const AVFilterPad perspective_inputs[]
Definition: vf_perspective.c:489
NULL
#define NULL
Definition: coverity.c:32
AV_PIX_FMT_YUVJ420P
@ AV_PIX_FMT_YUVJ420P
planar YUV 4:2:0, 12bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV420P and setting col...
Definition: pixfmt.h:78
AV_PIX_FMT_GRAY8
@ AV_PIX_FMT_GRAY8
Y , 8bpp.
Definition: pixfmt.h:74
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
OFFSET
#define OFFSET(x)
Definition: vf_perspective.c:57
perspective_outputs
static const AVFilterPad perspective_outputs[]
Definition: vf_perspective.c:498
PERSPECTIVE_SENSE_DESTINATION
@ PERSPECTIVE_SENSE_DESTINATION
coordinates give locations in destination of corners of source.
Definition: vf_perspective.c:62
AV_PIX_FMT_YUVA444P
@ AV_PIX_FMT_YUVA444P
planar YUV 4:4:4 32bpp, (1 Cr & Cb sample per 1x1 Y & A samples)
Definition: pixfmt.h:167
interpolation
static int interpolation(DeclickChannel *c, const double *src, int ar_order, double *acoefficients, int *index, int nb_errors, double *auxiliary, double *interpolated)
Definition: af_adeclick.c:336
AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
#define AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
Some filters support a generic "enable" expression option that can be used to enable or disable a fil...
Definition: avfilter.h:130
config_input
static int config_input(AVFilterLink *inlink)
Definition: vf_perspective.c:220
AV_PIX_FMT_YUVJ440P
@ AV_PIX_FMT_YUVJ440P
planar YUV 4:4:0 full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV440P and setting color_range
Definition: pixfmt.h:100
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_perspective.c:482
PerspectiveContext
Definition: vf_perspective.c:39
EVAL_MODE_INIT
@ EVAL_MODE_INIT
Definition: vf_perspective.c:66
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:224
AV_PIX_FMT_YUV444P
@ AV_PIX_FMT_YUV444P
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:71
AV_PIX_FMT_GBRP
@ AV_PIX_FMT_GBRP
planar GBR 4:4:4 24bpp
Definition: pixfmt.h:158
AVFILTER_FLAG_SLICE_THREADS
#define AVFILTER_FLAG_SLICE_THREADS
The filter supports multithreading by splitting frames into multiple parts and processing them concur...
Definition: avfilter.h:121
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AV_PIX_FMT_YUV422P
@ AV_PIX_FMT_YUV422P
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:70
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:192
AV_PIX_FMT_YUV411P
@ AV_PIX_FMT_YUV411P
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
Definition: pixfmt.h:73
AV_PIX_FMT_YUV410P
@ AV_PIX_FMT_YUV410P
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
Definition: pixfmt.h:72
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
Definition: vf_perspective.c:440
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Definition: opt.h:228
FLAGS
#define FLAGS
Definition: vf_perspective.c:58
AV_OPT_TYPE_CONST
@ AV_OPT_TYPE_CONST
Definition: opt.h:233
AV_PIX_FMT_YUVA422P
@ AV_PIX_FMT_YUVA422P
planar YUV 4:2:2 24bpp, (1 Cr & Cb sample per 2x1 Y & A samples)
Definition: pixfmt.h:166
CUBIC
#define CUBIC
Definition: vf_perspective.c:37